Delta Aurigae
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Delta Aurigae is an astrometric binary[11] star in the northern constellation of Auriga. Its name is a Bayer designation that is Latinized from δ Aurigae, and abbreviated Delta Aur or δ Aur. This star is visible to the naked eye with an apparent visual magnitude of 3.715.[2] Based upon its annual parallax shift of Script error: No such module "val".,[1] it is some Script error: No such module "convert". distant from the Earth, give or take a three light-year margin of error. It is drifting further away with a radial velocity of +10 km/s.[5] This star is the namesake for the Delta Aurigids, a meteor shower that occurs between October 6–15.[12] The radiant point for this shower passes several degrees to the south of the star.[13]
The variable radial velocity of this system was not recognized until 1999, more than a century following the first measurement in 1897. Delta Aurigae is a single-lined spectroscopic binary: periodic Doppler shifts in the star's spectrum indicate orbital motion. The pair have an orbital period of Script error: No such module "convert". and an eccentricity of 0.231. Based on the small amplitude of the radial velocity variation, the companion is most likely a small K- or early M-type main-sequence star with around half the mass of the Sun.[7]
The visible component of this system is an evolved giant star with a stellar classification of K0 IIIb.[4] It is a red clump star, indicating that it is generating energy through helium fusion at its core.[3] This star is 3.26[8] billion years old and is spinning with a projected rotational velocity of 4 km/s.[9] It has 1.63[8] times the mass of the Sun and has expanded to 11[9] times the Sun's radius. The star is radiating 62 times the Sun's luminosity[9] from the star's photosphere at an effective temperature of 4,786 K.[9] This heat gives the star the orange-hued glow of a K-type star.[14]
Name
In Indian astronomy, it is known by the name Prajapati Template:IPAc-en, from the Sanskrit प्रजापति prajāpati "the Lord of Created Beings".[15][16]
In Chinese, Script error: No such module "Lang". (Script error: No such module "Lang".), meaning Eight Kinds of Crops, refers to an asterism consisting of δ Aurigae, ξ Aurigae, 26 Camelopardalis, 14 Camelopardalis, 7 Camelopardalis, 9 Aurigae, 11 Camelopardalis and 31 Camelopardalis.[17] Consequently, the Chinese name for δ Aurigae itself is Script error: No such module "Lang". (Script error: No such module "Lang"., Template:Langx), refers to the rice.
References
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- ↑ Template:Cite simbad
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- ↑ "Auriga", by Richard Hinckley Allen in Star Names: Their Lore and Meaning
- ↑ Monier-Williams Sanskrit dictionary: pra-cchana—pra-jalpa
- ↑ Template:In lang 中國星座神話, written by 陳久金. Published by 台灣書房出版有限公司, 2005, Template:ISBN.
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